Gymea Bay flood map & planning overlays
A planning-constraint profile of Gymea Bay
(Sutherland Shire, NSW) - 2.76 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
2.76 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Gymea Bay's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Gymea Bay
Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.
Observed overflight - sampled 4 Sep to 2 Oct 2026
typical observed square 6 a day
Night movements: observed, lowest 1,500 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.
Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.
Gymea Bay at a glance
How Gymea Bay is zoned
Buying in Gymea Bay? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 2.76 km², Gymea Bay is highly constrained by planning overlays. About 17% of the suburb sits within a mapped flood overlay, and 13% is flagged bushfire-prone. There are 6 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 659 m² across 2,254 parcels.
Who lives in Gymea Bay
Census 2021 figures published by the ABS for the Gymea Bay suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 1133, and decile 10 within New South Wales. The national average is 1000.
Age profile
Share of Gymea Bay's 6,983 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Gymea - Grays Point, the wider ABS statistical area containing Gymea Bay. There is no annual population series published at suburb level, so this describes the surrounding area rather than Gymea Bay itself.
16,832 in 2001 to 18,888 in 2025, up 12%.
Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.
Gymea Bay data sources and coverage
“Not mapped” means we hold no source layer for this suburb - never an all-clear.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Aircraft noise contours (ANEF) | Not held | NSW Government spatial services, NSW ePlanning and published council flood studies, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 3 October 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific Gymea Bay address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
Aircraft have been seen below 3,000 ft over about 19% of Gymea Bay. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Gymea Bay lot.
See what's in the $9 report →Gymea Bay planning - frequently asked
Is Gymea Bay flood-prone?
About 17% of Gymea Bay falls within a mapped flood overlay, against the council-wide suburb average of 22%.
Is Gymea Bay bushfire-prone?
Around 13% of Gymea Bay is mapped as bushfire-prone, compared with a Sutherland Shire average of 46%.
Is Gymea Bay under a flight path?
Aircraft were observed below 3,000 ft over about 19% of Gymea Bay, and over about 100% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 1,000 ft, with an average of 5,000 ft. At the busiest point in the suburb about 23 aircraft a day were recorded passing over one 500 m square. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.
What is the zoning in Gymea Bay?
The dominant planning zone in Gymea Bay is Low Density Residential, though the suburb also includes Environmental Management and Natural Waterways.
Does Gymea Bay have heritage-listed places?
Gymea Bay has 6 heritage-listed places on record.
What is the typical lot size in Gymea Bay?
Across 2,254 surveyed parcels in Gymea Bay, the median lot size is about 659 m². There are also 53 registered easements mapped in the suburb.
Does Gymea Bay have a train station?
There is no train station inside Gymea Bay itself. The suburb is served by 36 bus stops.
What is the population of Gymea Bay?
At the 2021 Census Gymea Bay had 6,983 usual residents, with a median age of 42 and an average household size of 3.1 people. The wider Gymea - Grays Point statistical area, which contains Gymea Bay, went from 16,832 people in 2001 to 18,888 in 2025, up 12%.
Is Gymea Bay an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Gymea Bay scores 1133 and sits in decile 10 of 10 nationally and decile 10 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Gymea Bay?
Median household income in Gymea Bay was $3,047 a week at the 2021 Census, against $2,626 for the typical suburb in Sutherland Shire. Median rent was $680 a week and the median mortgage repayment $3,033 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Grays Point | 1.1 km | 30% | 26% |
| Yowie Bay | 1.4 km | 37% | 2% |
| Gymea | 1.7 km | 11% | 1% |
| Kirrawee | 2.4 km | <1% | 13% |
| Miranda | 2.4 km | 16% | <1% |
| Audley | 2.9 km | 2% | 100% |
| Caringbah South | 3.0 km | 22% | 1% |
| Lilli Pilli | 3.2 km | 59% | 0% |
| Sutherland | 3.5 km | <1% | 25% |
| Kareela | 3.8 km | 8% | 12% |